Grain-Size Effects on the High-Temperature Oxidation of Cu added Austenitic stainless steel
- Grain-Size Effects on the High-Temperature Oxidation of Cu added Austenitic stainless steel
- 김주헌; 김동익; Satyam Suwas; 에릭플러리; 이경우
- austenitic stainless steel; grain size effect; oxidation resistance; grain boundary
- Issue Date
- 8th International Symposium on High-Temperature Corrosion and Protection of Materials
- High temperature oxidation behavior of Cu-added austenitic stainless steels in a water vapor atmosphere
was investigated. Samples were prepared by various thermo mechanical treatments to make different grain size
(8~30μm). Similar Σ3 grain boundary fraction was achieved to eliminate the grain boundary characteristics effect.
Samples were oxidized in an air furnace at 700°C with 20% water vapor atmosphere. On the fine grained sample,
uniform Cr2O3 layer was formed, which increased the overall oxidation resistance. Whereas on the coarse grained
sample, additional Fe2O3 layer was formed on the Cr-rich oxide layer, which resulted in a relatively high oxidation
rate. In fine grained sample, grain boundaries act as rapid diffusion paths for Cr and provide enough Cr to form
Cr2O3 oxide on the entire sample surface.
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